Part of the value prop of Accenture is that they employee inexpensive foreign labor. They have 300,000 employees in India alone[0]. If those people are working at $20,000 a year, that's 300,000 * 65,000 = $19.5 billion in yearly profit from those employees alone. And India is a relatively expensive country these days; their margins in Vietnam and Thailand are probably even greater.
[0] https://timesofindia.indiatimes.com/business/india-business/...